[Base] Remove deprecated Qt < 5.9 code

src/Base/TimeInfo.cpp

@@ -79,18 +79,8 @@ void TimeInfo::setTime_t (uint64_t seconds)
 
 std::string TimeInfo::currentDateTimeString()
 {
-#if (QT_VERSION >= 0x050300)
     return QDateTime::currentDateTime().toTimeSpec(Qt::OffsetFromUTC)
         .toString(Qt::ISODate).toStdString();
-#else
-    QDateTime local = QDateTime::currentDateTime();
-    QDateTime utc = local.toUTC();
-    utc.setTimeSpec(Qt::LocalTime);
-    int utcOffset = utc.secsTo(local);
-    local.setUtcOffset(utcOffset);
-    QString dm = local.toString(Qt::ISODate);
-    return dm.toStdString();
-#endif
 }
 
 std::string TimeInfo::diffTime(const TimeInfo &timeStart,const TimeInfo &timeEnd )